WO2022143637A1 - 电动工具 - Google Patents

电动工具 Download PDF

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Publication number
WO2022143637A1
WO2022143637A1 PCT/CN2021/141991 CN2021141991W WO2022143637A1 WO 2022143637 A1 WO2022143637 A1 WO 2022143637A1 CN 2021141991 W CN2021141991 W CN 2021141991W WO 2022143637 A1 WO2022143637 A1 WO 2022143637A1
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WO
WIPO (PCT)
Prior art keywords
nut
gear
intermediate shaft
friction plate
motor
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PCT/CN2021/141991
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English (en)
French (fr)
Inventor
宋巨辉
彭益超
Original Assignee
江苏东成工具科技有限公司
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Application filed by 江苏东成工具科技有限公司 filed Critical 江苏东成工具科技有限公司
Publication of WO2022143637A1 publication Critical patent/WO2022143637A1/zh
Priority to US18/146,458 priority Critical patent/US20230211487A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
    • F16D7/024—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
    • F16D7/025—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs

Definitions

  • the invention relates to the field of electric tools, in particular to an electric tool with a clutch assembly.
  • the traditional power tool is usually equipped with a clutch assembly.
  • the clutch assembly separates the transmission of the motor from the output part.
  • the clutch assembly includes a small bevel gear and a large plate gear sleeved on the small bevel gear, a friction plate, a stop washer and an elastic washer.
  • the large plate gear A friction plate is installed on both sides, a stop washer is arranged on the outer side of the two friction plates, an elastic washer is arranged on the outer side of the stop washer under the large plate gear, and a nut is arranged on the outer side of the elastic washer.
  • the constituent parts of the entire clutch assembly are assembled in sequence from top to bottom, which results in a relatively long length of the clutch assembly, which increases the volume of the power tool.
  • the present invention provides a power tool with miniaturization and easy assembly.
  • a power tool comprising a casing, a motor located in the casing, and a transmission assembly driven by the motor;
  • the transmission assembly includes a clutch assembly;
  • the clutch The assembly includes an intermediate shaft, an elastic member and a clutch block sleeved on the intermediate shaft, one end of the elastic member is supported on the intermediate shaft, and the other end is supported on the clutch block;
  • the clutch block includes a friction plate , a nut and a gear, the motor drives the gear to rotate, one end of the nut is supported on one side of the gear, the other end passes through the gear and is clamped to the friction plate, and the nut is threadedly connected to the on the intermediate shaft and drive the friction plate to squeeze on the elastic member;
  • the motor drives the gear and drives the intermediate shaft to rotate together; when the driving force of the motor to drive the gear is greater than that of the gear and the When the friction force between the friction plate and the nut, the gear rotates relative to the friction plate and
  • a further improvement solution is: the thread tightening rotation direction of the nut is the same as the output rotation direction of the intermediate shaft.
  • a further improvement scheme is that: the intermediate shaft is provided with an external thread that cooperates with the nut and a stopper portion located at the front end of the external thread, and the nut and the stopper portion are arranged at intervals.
  • a further improvement scheme is that: the gear is provided with a receiving groove which is recessed inward from the rear end, and one end of the nut is received in the receiving groove and abuts against the inner wall surface of the receiving groove.
  • a further improvement solution is: the nut is provided with a flat position or a keyway at the front end, and the friction plate is engaged with the flat position or the keyway, so that the friction plate and the nut are relatively stationary in the circumferential direction.
  • a further improvement scheme is: the rear end of the nut is recessed forward with several fixing holes.
  • a further improvement scheme is that: the elastic piece is composed of a plurality of superimposed stamping and formed elastic sheets and is sleeved on the intermediate shaft.
  • a further improvement scheme is: the motor is provided with a motor shaft extending in the front-rear direction, and the front end of the motor shaft is engaged with the gear; the transmission assembly includes an output assembly connected to the clutch assembly, and the output assembly has The output shaft extending forward of the casing and the large gear held at the rear end of the output shaft; the intermediate shaft has intermediate shaft teeth located at the front end and integrally formed, the intermediate shaft teeth engage the large gear and drive the The output shafts rotate together.
  • a further improvement scheme is: the rotation axes of the output shaft, the intermediate shaft and the motor shaft are all parallel to each other.
  • the present invention has the following beneficial effects: one end of the nut is supported on one side of the gear, and the other end passes through the gear and is clamped to the friction plate, which ensures that the nut and the intermediate shaft have stable stability.
  • the thread engagement length shortens the overall length of the clutch assembly, which is beneficial to the miniaturization of the power tool, and the gear is clamped between the friction plate and the nut, which is beneficial to improve the convenience of assembly.
  • the nut is threaded on the intermediate shaft and pushes against the friction plate to compress the elastic member.
  • the output rotation direction of the intermediate shaft is consistent with the tightening rotation direction of the nut.
  • the gear can automatically compensate for the wear of the clutch assembly by tightening the nut through friction, so as to solve the problem that the pressure of the elastic member is weakened after the wear of the components.
  • the friction plate is arranged between the elastic member and the gear and is circumferentially stationary on the end of the nut. One end of the nut and the friction plate can transmit the friction force of the gear to the nut at the same time, increasing the number of gears. The tightening force transmitted to the nut.
  • FIG. 1 is a perspective view of a power tool of the present invention
  • Fig. 2 is the partial cutaway schematic diagram in Fig. 1;
  • FIG 3 is a perspective view of the clutch assembly in Figure 2;
  • FIG. 4 is a cross-sectional view of FIG. 3 .
  • FIGS. 1 to 4 are schematic diagrams of the power tool 100 of the present invention.
  • the power tool 100 includes a housing 10 , a motor 2 located in the housing 10 , and a transmission assembly 3 driven by the motor 2 .
  • the transmission assembly 3 includes a clutch assembly 31 with an overload clutch mode and an output assembly 32 connected to the clutch assembly 31; when the power tool 100 is working normally, the motor 2 drives the clutch assembly 31 and drives all The output assembly 32 performs rotational output; when the transmission assembly 3 is in the overload clutch mode, the output assembly 32 is held by an external force and cannot rotate to output, and the clutch assembly 31 separates the transmission of the motor 2 from the output assembly 32 .
  • the clutch assembly 31 includes an intermediate shaft 311 located in the housing 10 , an elastic member 313 sleeved on the outer circumference of the intermediate shaft 311 and a clutch block.
  • the clutch block includes a gear 312 , a nut 314 and a friction plate 315 .
  • the elastic member 313 is composed of a plurality of stamped elastic sheets and is sleeved on the intermediate shaft 311 , defining the output direction of the power tool 100 as the front, and the front end of the elastic member 313 abuts against the intermediate shaft 311 And the rear end presses the friction plate 315 .
  • the friction plate 315 is located between the elastic member 313 and the gear 312 , one end of the nut 314 is supported on one side of the gear 312 , and the other end passes through the gear 312 and is clamped to the friction plate 315 , the nut 314 is provided with a flat position or a keyway at the front end, the friction plate 315 is engaged with the flat position or the keyway and protrudes from the front end of the nut 314, so that the friction plate 315 and the nut 314 Relatively stationary in the circumferential direction.
  • the intermediate shaft 311 is provided with external threads, and the nut 314 is threadedly connected to the intermediate shaft 311 and pushes against the friction plate 315 to compress the elastic member 313 .
  • the nut 314 is provided with a stepped portion protruding radially outward from the rear end, the stepped portion pushes the gear 312 toward the elastic member 313 , and the gear 312 is provided with a receiving groove recessed inward from the rear end. , the step portion is accommodated in the accommodating groove and abuts against the inner wall surface of the accommodating groove, so as to push the gear 312 toward the elastic member 313 .
  • the stepped portion of the nut 314 is accommodated in the accommodating groove and does not exceed the rear end surface of the gear 312 , which is beneficial to shorten the overall length of the clutch assembly 31 and is beneficial to the miniaturization of the power tool 100 .
  • the motor 2 is provided with a motor shaft extending in the front-rear direction, and the front end of the motor shaft is engaged with the gear 312 .
  • the output assembly 32 has an output shaft 321 extending forward from the housing 10 and a large gear 322 fixed at the rear end of the output shaft 321; the intermediate shaft 311 has an integrally formed intermediate shaft tooth 311' at the front end.
  • the intermediate shaft teeth 311' engage with the large gear 322, and the rotation axes of the output shaft 321, the intermediate shaft 311 and the motor shaft are all parallel to each other.
  • the motor 2 When the transmission assembly 3 is in the non-overload clutch mode, that is, when it is working normally, the motor 2 is connected to the gear 312 in a driving manner, and is pressed by the elastic member 313 , and the gear 312 is connected to the friction plate 315 and the
  • the stepped portion of the nut 314 generates static friction and drives the nut 314 to rotate together, and then the nut 314 drives the intermediate shaft 311 to rotate together, and the intermediate shaft teeth 311 ′ drive the output shaft 321 to rotate together.
  • the output shaft 321 cannot be rotated by the external force, and neither the large gear 322 fixedly connected with the output shaft 321 nor the intermediate shaft teeth 311 ′ meshing with the large gear 322
  • the nut 314 that is tightened on the intermediate shaft 311 cannot be rotated, and the driving force of the motor 2 to drive the gear 312 is greater than that of the gear 312, the friction plate 315 and the step of the nut 314.
  • the friction plate 315 and the stepped portion of the nut 314 rotate and generate sliding friction.
  • only the motor 2 drives the gear 312 to rotate together, so as to prevent the motor 2 from being burnt due to overload.
  • the rear end of the nut 314 is recessed forward with several fixing holes.
  • the nut 314 in this embodiment has two fixing holes.
  • the intermediate shaft 311 is provided with a stopper at the front end of the external thread.
  • the nut 314 penetrates the gear 312 in the front-rear direction and is spaced from the stopper. That is, keep a certain distance.
  • the output rotation direction of the intermediate shaft 311 is consistent with the tightening rotation direction of the nut 314.
  • the gear 312 the friction plate 315 and the stepped portion of the nut 314 are not worn, although the gear 312 passes through static friction or sliding friction
  • the nut 314 is continuously tightened, but because the thrust force of the elastic member 313 on the gear 312 is large enough, the nut 314 cannot be tightened in the tightening direction.
  • the gear 312, the friction plate 315 and the stepped portion of the nut 314 are worn out, the thrust force of the elastic member 313 on the gear 312 is reduced, and the gear 312 passes the static frictional force. Or the nut 314 is continuously tightened by sliding friction, and cannot be rotated and tightened when the thrust force of the elastic member 313 on the gear 312 is large enough.
  • one end of the nut 314 is supported on one side of the gear 312 , and the other end passes through the gear 312 and is clamped to the friction plate 315 , which not only ensures that the nut 314 and the intermediate shaft 311 have stable stability
  • the thread engagement length shortens the overall length of the clutch assembly 31, which is beneficial to the miniaturization of the power tool 100, and the gear 312 is clamped between the friction plate 315 and the nut 314, which is beneficial to improve the convenience of assembly.
  • the nut 314 is screwed on the intermediate shaft 311 and pushes against the gear 312 to compress the elastic member 313 .
  • the output rotation direction of the intermediate shaft 311 is consistent with the tightening rotation direction of the nut 314 .
  • the gear 312 can tighten the nut 314 through friction to automatically compensate for the wear of the clutch assembly 31, so as to solve the problem that the pressure of the elastic member 313 is affected by the wear of the components. weakening problem.
  • the friction plate 315 is disposed between the elastic member 313 and the gear 312 and is sleeved on the end of the nut 314 statically in the circumferential direction. The stepped portion of the nut 314 and the friction plate 315 can transmit the transmission The frictional force is transmitted to the nut 314 , increasing the tightening force transmitted by the gear 312 to the nut 314 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Power Tools In General (AREA)

Abstract

一种电动工具（100），包括外壳（10）、位于外壳（10）内的电机（2）及由电机（2）驱动的离合组件（31）；离合组件（31）包括中间轴（311）及套设于中间轴（311）上的弹性件（313）与离合块，弹性件（313）一端支撑于中间轴（311）上，另一端支撑于离合块上；离合块包括摩擦片（315）、螺母（314）及齿轮（312），电机（2）驱动齿轮（312）旋转运动，螺母（314）一端支撑于齿轮（312）一侧，另一端穿过齿轮（312）并卡持于摩擦片（315），螺母（314）螺纹连接于中间轴（311）上并驱动摩擦片（315）挤压于弹性件（313）上。

Description

电动工具 【技术领域】
本发明涉及电动工具领域，特别涉及一种具有离合组件的电动工具。
【背景技术】
传统电动工具为了防止输出部被外力卡住后导致电机烧毁，通常该电动工具内配备有离合组件，当输出部被卡住不能转动时，离合组件将电机的传动与输出部进行分离。
请参照中国实用新型专利公告第CN2842064Y号中揭露了一种离合组件，该离合组件包括小锥齿轮及套设于小锥齿轮上的大盘齿轮、摩擦片、止动垫片及弹性垫圈，大盘齿轮两侧均装一个摩擦片，两个摩擦片外侧各设置一个止动垫片，大盘齿轮下方的止动垫片外侧设置弹性垫圈，弹性垫圈外侧设置螺母。整个离合组件的构成部件自上而下依次组装，导致该离合器组件的长度偏长，增大了电动工具的体积。另外该离合组件在长期使用后，摩擦片与大盘齿轮之间出现磨损，弹性垫圈对摩擦片施加的压力减少，此时需要将电动工具壳体拆开并取出该离合组件，将螺母进行再次紧固，以达到大盘齿轮与摩擦片磨损之前弹性垫圈对摩擦片施加的压力值，但该螺母的紧固操作繁琐且耗费时间。
因此，有必要设计一种新的电动工具，以解决电动工具内的离合组件偏长和需要不断紧固螺母的问题。
【发明内容】
为解决上述问题，本发明提供一种具有小型化且便于组装的电动工具。
为解决上述技术问题，本发明采用如下技术方案：一种电动工具，包括外壳、位于所述外壳内的电机及由所述电机驱动的传动组件；所述传动组件包括具有离合组件；所述离合组件包括中间轴及套设于所述中间轴上的弹性件与离 合块，所述弹性件一端支撑于所述中间轴上，另一端支撑于所述离合块上；所述离合块包括摩擦片、螺母及齿轮，所述电机驱动该齿轮旋转运动，所述螺母一端支撑于所述齿轮一侧，另一端穿过所述齿轮并卡持于所述摩擦片，所述螺母螺纹连接于所述中间轴上并驱动所述摩擦片挤压于所述弹性件上；所述电机驱动所述齿轮并带动所述中间轴共同转动；当所述电机驱动所述齿轮的驱动力大于所述齿轮与所述摩擦片和螺母的摩擦力时，所述齿轮相对所述摩擦片和螺母旋转运动。
进一步改进方案为：所述螺母的螺纹紧固旋向与所述中间轴的输出旋向相同。
进一步改进方案为：所述中间轴上设有与所述螺母配合的外螺纹及位于所述外螺纹前端的止挡部，所述螺母与所述止挡部间隔设置。
进一步改进方案为：所述齿轮设有自后端面向内凹陷的收容槽，所述螺母的一端容纳于所述收容槽内且抵靠于所述收容槽的内壁面。
进一步改进方案为：所述螺母设有位于前端部的扁位或键槽，所述摩擦片卡合于所述扁位或键槽，以使所述摩擦片与所述螺母在周向上相对静止。
进一步改进方案为：所述螺母的后端向前凹设有数个固定孔。
进一步改进方案为：所述弹性件由数个叠加的冲压成型的弹片组成且套设于所述中间轴上。
进一步改进方案为：所述电机设有沿前后方向延伸的电机轴，所述电机轴的前端啮合于所述齿轮；所述传动组件包括连接于所述离合组件的输出组件，所述输出组件具有向前延伸出所述外壳的输出轴及固持于所述输出轴后端的大齿轮；所述中间轴具有位于前端且一体成型的中间轴齿，所述中间轴齿啮合所述大齿轮并带动所述输出轴共同旋转。
进一步改进方案为：所述输出轴、所述中间轴及所述电机轴的旋转轴线均相互平行。
与现有技术相比本发明具有如下有益效果：将螺母一端支撑于所述齿轮一侧，另一端穿过所述齿轮并卡持于所述摩擦片，既保证了螺母与中间轴具有稳定的螺纹啮合长度，又缩短了离合组件的整体长度，有利于电动工具的小型化，且将齿轮夹持于摩擦片与螺母之间，有利于改善组装便利性。所述螺母螺纹连接于所述中间轴上并抵推所述摩擦片以压缩所述弹性件，所述中间轴的输出旋向与螺母的紧固旋向一致，当齿轮与螺母和摩擦片发生磨损后，所述齿轮可以通过摩擦力旋紧螺母进而自动补偿了离合组件发生的磨损，以解决部件磨损后弹性件的压力被减弱的问题。另外所述摩擦片设置于所述弹性件与齿轮之间并周向静止的套设于螺母的端部，所述螺母的一端和摩擦片可以同时将齿轮的摩擦力传递给螺母，增加了齿轮传递给螺母的紧固力。
【附图说明】
图1是本发明电动工具的立体视图；
图2是图1中局部剖切示意图；
图3是图2中离合组件的立体视图；
图4是图3的剖视图。
【具体实施方式】
以下结合附图和实施例，对本发明的具体实施方式作进一步描述，其中，本电动工具100的实施方式以钻作为实例详细说明。
请参照图1至图4所示，为本发明的电动工具100的示意图，所述电动工具100包括：外壳10、位于所述外壳10内的电机2及由所述电机2驱动的传动组件3；所述传动组件3包括具有过载离合模式的离合组件31及连接于所述离 合组件31的输出组件32；所述电动工具100正常工作时，所述电机2驱动所述离合组件31并带动所述输出组件32进行旋转输出；当所述传动组件3处于过载离合模式时，所述输出组件32被外力卡持无法转动输出，所述离合组件31将电机2的传动与输出组件32进行脱离。
所述离合组件31包括位于所述外壳10内的中间轴311及套设于所述中间轴311外周上的弹性件313与离合块，所述离合块包括齿轮312、螺母314与摩擦片315。所述弹性件313由数个冲压成型的弹片叠加组成且套设于所述中间轴311上，定义电动工具100的输出方向为前方，所述弹性件313的前端抵靠于所述中间轴311且后端抵压所述摩擦片315。所述摩擦片315位于所述弹性件313与所述齿轮312之间，所述螺母314一端支撑于所述齿轮312一侧，另一端穿过所述齿轮312并卡持于所述摩擦片315，所述螺母314设有位于前端部的扁位或键槽，所述摩擦片315卡合于所述扁位或键槽并突出于螺母314的前端，以使所述摩擦片315与所述螺母314在周向上相对静止。所述中间轴311上设有外螺纹，所述螺母314螺纹连接于所述中间轴311上并抵推所述摩擦片315以压缩所述弹性件313。所述螺母314设有自后端沿径向往外凸伸的台阶部，该台阶部向所述弹性件313抵推所述齿轮312，所述齿轮312设有自后端面向内凹陷的收容槽，所述台阶部容纳于所述收容槽内且抵靠于所述收容槽的内壁面，以向所述弹性件313抵推所述齿轮312。本实施方式中的螺母314的台阶部容纳于所述收容槽内且未超出所述齿轮312的后端面，有利于缩短离合组件31的整体长度，有利于电动工具100的小型化。
所述电机2设有沿前后方向延伸的电机轴，所述电机轴的前端啮合于所述齿轮312。所述输出组件32具有向前延伸出所述外壳10的输出轴321及固持于所述输出轴321后端的大齿轮322；所述中间轴311具有位于前端且一体成型的 中间轴齿311’。所述中间轴齿311’啮合所述大齿轮322，所述输出轴321、中间轴311及电机轴的旋转轴线均相互平行。
当所述传动组件3处于非过载离合模式时，即正常工作时，所述电机2传动连接所述齿轮312，经由所述弹性件313抵压，所述齿轮312分别与所述摩擦片315及螺母314的台阶部产生静摩擦力并带动所述螺母314共同旋转，进而所述螺母314带动所述中间轴311共同转动，中间轴齿311’带动所述输出轴321共同旋转。
当所述传动组件3处于过载离合模式时，所述输出轴321被外力卡持无法转动，与所述输出轴321固定连接的大齿轮322、与大齿轮322啮合的中间轴齿311’均无法转动，此时拧紧于中间轴311上螺母314也无法转动，所述电机2驱动所述齿轮312的驱动力大于齿轮312与摩擦片315、螺母314的台阶部产生静摩擦力，进而齿轮312相对于所述摩擦片315及螺母314的台阶部转动并产生滑动摩擦，此时仅电机2带动齿轮312共同转动，以防止电机2因过载而烧毁。
所述螺母314的后端向前凹设有数个固定孔，本实施方式中的螺母314具有两个固定孔，当安装所述离合组件31时，操作人员借助工具插入该两个固定孔并将所述螺母314旋紧于中间轴311上，改变旋紧的程度可改变所述齿轮312与摩擦片315、螺母314的台阶部产生的最大静摩擦力，进而可以调节传动组件3的发生过载离合的临界扭矩值。
所述中间轴311设有位于所述外螺纹前端的止挡部，在所述电动工具100完成安装时，所述螺母314沿前后方向贯穿所述齿轮312并与所述止挡部间隔设置，即保持有一定的距离。所述中间轴311的输出旋向与螺母314的紧固旋向一致，所述齿轮312与摩擦片315、螺母314的台阶部未发生磨损时，虽然所 述齿轮312通过静摩擦力或滑动摩擦力不断的紧固所述螺母314，但是因为所述弹性件313对齿轮312的推力足够大，所述螺母314无法再朝向紧固的方向旋紧。在所述电动工具100长时间负载工作后，所述齿轮312与摩擦片315、螺母314的台阶部发生磨损，所述弹性件313对齿轮312的抵推力减小，所述齿轮312通过静摩擦力或滑动摩擦力不断的紧固所述螺母314，并当所述弹性件313对齿轮312的推力足够大时无法进行旋转紧固。
本发明的电动工具100，将螺母314一端支撑于所述齿轮312一侧，另一端穿过所述齿轮312并卡持于所述摩擦片315，既保证了螺母314与中间轴311具有稳定的螺纹啮合长度，又缩短了离合组件31的整体长度，有利于电动工具100的小型化，且将齿轮312夹持于摩擦片315与螺母314之间，有利于改善组装便利性。所述螺母314螺纹连接于所述中间轴311上并抵推所述齿轮312以压缩所述弹性件313，所述中间轴311的输出旋向与螺母314的紧固旋向一致，当齿轮312与螺母314的台阶部和摩擦片315发生磨损后，所述齿轮312可以通过摩擦力旋紧所述螺母314进而自动补偿了离合组件31发生的磨损，以解决部件磨损后弹性件313的压力被减弱的问题。另外所述摩擦片315设置于所述弹性件313与齿轮312之间并周向静止的套设于螺母314的端部，所述螺母314的台阶部、摩擦片315可以同时将齿轮312传递的摩擦力传递给螺母314，增加了齿轮312传递给螺母314的紧固力。
本发明不局限于上述具体实施方式，本发明的保护范围以权利要求书的内容为准。

Claims (9)

  1. 一种电动工具，包括外壳、位于所述外壳内的电机及由所述电机驱动的传动组件；所述传动组件包括具有离合组件；所述离合组件包括中间轴及套设于所述中间轴上的弹性件与离合块，所述弹性件一端支撑于所述中间轴上，另一端支撑于所述离合块上；其特征在于：所述离合块包括摩擦片、螺母及齿轮，所述电机驱动该齿轮旋转运动，所述螺母一端支撑于所述齿轮一侧，另一端穿过所述齿轮并卡持于所述摩擦片，所述螺母螺纹连接于所述中间轴上并驱动所述摩擦片挤压于所述弹性件上；所述电机驱动所述齿轮并带动所述中间轴共同转动；当所述电机驱动所述齿轮的驱动力大于所述齿轮与所述摩擦片和螺母的摩擦力时，所述齿轮相对所述摩擦片和螺母旋转运动。
  2. 根据权利要求1所述的电动工具，其特征在于：所述螺母的螺纹紧固旋向与所述中间轴的输出旋向相同。
  3. 根据权利要求2所述的电动工具，其特征在于：所述中间轴上设有与所述螺母配合的外螺纹及位于所述外螺纹前端的止挡部，所述螺母与所述止挡部间隔设置。
  4. 根据权利要求3所述的电动工具，其特征在于：所述齿轮设有自后端面向内凹陷的收容槽，所述螺母的一端容纳于所述收容槽内且抵靠于所述收容槽的内壁面。
  5. 根据权利要求1所述的电动工具，其特征在于：所述螺母设有位于前端部的扁位或键槽，所述摩擦片卡合于所述扁位或键槽，以使所述摩擦片与所述螺母在周向上相对静止。
  6. 根据权利要求1所述的电动工具，其特征在于：所述螺母的后端向前凹设有数个固定孔。
  7. 根据权利要求1所述的电动工具，其特征在于：所述弹性件由数个叠加的冲 压成型的弹片组成且套设于所述中间轴上。
  8. 根据权利要求1所述的电动工具，其特征在于：所述电机设有沿前后方向延伸的电机轴，所述电机轴的前端啮合于所述齿轮；所述传动组件包括连接于所述离合组件的输出组件，所述输出组件具有向前延伸出所述外壳的输出轴及固持于所述输出轴后端的大齿轮；所述中间轴具有位于前端且一体成型的中间轴齿，所述中间轴齿啮合所述大齿轮并带动所述输出轴共同旋转。
  9. 根据权利要求8所述的电动工具，其特征在于：所述输出轴、所述中间轴及所述电机轴的旋转轴线均相互平行。
PCT/CN2021/141991 2020-12-29 2021-12-28 电动工具 WO2022143637A1 (zh)

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US3741527A (en) * 1971-10-12 1973-06-26 Eaton Corp Stress limiting hoist
GB1474653A (en) * 1974-05-21 1977-05-25 Metabowerke Kg Electric tool and torque-limiting clutch combination
DE3942806A1 (de) * 1989-12-23 1991-06-27 Metabowerke Kg Rutschkupplung zur begrenzung des maximalen drehmoments eines elektrowerkzeugs
CN205734746U (zh) * 2016-07-08 2016-11-30 吴海勇 过载自动离合电锤
CN107420509A (zh) * 2017-06-06 2017-12-01 苏州大可机械有限公司 电动工具
CN112576638A (zh) * 2020-12-29 2021-03-30 江苏东成工具科技有限公司 电动工具

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741527A (en) * 1971-10-12 1973-06-26 Eaton Corp Stress limiting hoist
GB1474653A (en) * 1974-05-21 1977-05-25 Metabowerke Kg Electric tool and torque-limiting clutch combination
DE3942806A1 (de) * 1989-12-23 1991-06-27 Metabowerke Kg Rutschkupplung zur begrenzung des maximalen drehmoments eines elektrowerkzeugs
CN205734746U (zh) * 2016-07-08 2016-11-30 吴海勇 过载自动离合电锤
CN107420509A (zh) * 2017-06-06 2017-12-01 苏州大可机械有限公司 电动工具
CN112576638A (zh) * 2020-12-29 2021-03-30 江苏东成工具科技有限公司 电动工具

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